Saw Dominic Keating at Shore Leave last year. I didn't meet him myself, but I watched him signing autographs for a while. He seemed to be having a good time and was very friendly. May or may not have been sober.
The only actors I've actually talked w/ are Dominic West and Sonja Sohn from The Wire
. I approached them during a pause in filming on the street in front of where I worked at the time. They were both very friendly and happy to sign autographs.